Having the strength and power to drive up out of a squat while loaded with weight is only half the battle. The mental determination to succeed will often increase your ability to complete a lift. Never stop fighting or give in to the doubt that you can do it. You will probably be surprised at how much your body is really capable of doing!

Workout:

Find your max Back Squat.

Then, do 3 rounds for time of:
12 Back Squats
21 knees to elbows
500 meter run